Creating this delicious Blueberry Buttermilk Pancake Casserole can be quite simple if you follow these steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking dish or casserole dish.
2. Mix Dry Ingredients: In a large bowl, whisk together the flour, baking powder, baking soda, salt, and sugar.
3. Prepare the Wet Ingredients: In another bowl, beat the eggs and then mix in the buttermilk, milk, vegetable oil, and vanilla extract until well combined.
4. Combine Mixtures: Gradually pour the wet ingredients into the dry ingredients, stirring gently until just combined. Avoid overmixing.
5. Add Blueberries: Fold in the blueberries gently to ensure they are evenly distributed throughout the batter.
6. Pour into Dish: Carefully pour the batter into the prepared baking dish. Smooth the top with a spatula.
7. Bake: Bake in the preheated oven for approximately 30-35 minutes or until the top is golden brown and a toothpick inserted in the center comes out clean.
8. Cool and Serve: Allow the casserole to cool for about 10 minutes before serving. Dust with powdered sugar if desired for an extra touch.

Following these steps will help you prepare a delicious Blueberry Buttermilk Pancake Casserole with ease!